Derive the expression for diffraction from a rectangular aperture.
We consider diffraction from apertures other than a slit. For example consider
a rectangular aperture as shown below. If
is the source strength per unit area (assumed to be constant over the entire
area in this example) and
is an infinitesmal area at a point in the aperture then we have:
We see from the figure that
and that
Thus we use
to write
or
We are only considering Fraunhofer diffraction so
are much larger than
and
and we can rewrite
and then finally expanding using the binomial theorem and taking only the most
significant terms
So we have
or using the fact that
is large
which we integrate to get the field
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life